Note: Descriptions are shown in the official language in which they were submitted.
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A BOILER
CROSS-REFERENCE TO RELATED APPLICATIONS
Not Applicable
STATEMENT REGARDING FEDERALLY SPONSORED
RESEARCH OR DEVELOPMENT
Not Applicable
INCORPORATION-BY-REFERENCE OF MATERIAL SUBMITTED ON A
COMPACT DISC
Not Applicable
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is in the field of heat exchange, and more particularly, is a
boiler.
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2. Description of Related Art
Boilers are common appliances for heat change, which heat water contained in
the boiler
by burning of fuel. The heated water is usually used in many ways in life such
as getting
warm, bathing and drinking.
A method of working of a conventional boiler is usually like this: a spiral
water pipe is
provided in a hearth of a boiler. The water pipe is in communication with a
tank of the
boiler. In a process of heating, high temperature gas from combustion in the
hearth heats
the water pipe, and the water in the water pipe is then heated and driven to
run into the
tank of the boiler.
In the above mentioned method of heating, the high temperature gas moves
upward in the
hearth at a very high speed and quickly passes the water pipe and then exits
the boiler. In
a boiler with this working process, a time for the high temperature gas to
heat the water
pipe is very short. A large amount of gas exits the boiler after combustion in
a very short
time and the heat contained in the gas will not able to be completely
absorbed. Heat
energy is thus being wasted and a use ratio thereof is usually low.
At the same time, when the high temperature gas from the combustion in the
hearth heats
the water pipe, a layer of incrustation will form on an inner surface of the
water pipe after
a long time of working as the water pipe is directly heated. The incrustation
will not only
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decrease a heat ratio to the water pipe, but also clog the water pipe, which
enhance a
malfunction ratio thereof.
BRIEF SUMMARY OF THE INVENTION
The main object of the invention is to provide a boiler which is able to
increase a use
ratio of heat energy of fuel therein and decrease a malfunction ratio thereof.
In order to accomplish the above object, the present invention provides a
boiler having a
tank, a hearth contained in the tank, a gas pipe having one end in
communication with a
gas exit of the hearth and the other end passing through the hearth, a
combustor in
communication with a bottom of the hearth, and a fuel supply device being
connected to
a fuel inlet of the combustor.
Preferably, a plurality of heat exchange fins is formed on a portion of the
gas pipe in the
tank.
Preferably, a dust collection box is provided at the end of the gas pipe
passing through
the tank, and at least one filter screen is disposed in the dust collection
box.
Preferably, one heat insulation layer is provided round an outer surface of
the tank.
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Preferably, a plurality of air supply holes is defined in a wall of the
hearth, an air supply
chamber is formed on an outside surface of the hearth surrounding the
plurality of air
supply holes, and an air supply pipe is provided air communicating the air
supply
chamber.
Preferably, the air supply chamber is of a circular shape and the air supply
holes are
evenly disposed in the hearth.
Preferably, the combustor has a combustion chamber, an ash excretion roller
and an ash
excretion motor, an ignition bar being in a bottom of the combustion chamber,
a plurality
of air inlets being defined in the bottom near a fuel inlet of the combustion
chamber, the
ash excretion roller being disposed in the bottom near an ash outlet of the
combustion
chamber and rolling in a direction to the ash outlet, the ash excretion roller
being of
barrel shape having air vents defined in a wall thereof, an air supply chamber
being
disposed under the combustion chamber, the air supply chamber being in
communication
with the air inlets at the fuel inlet and the air vents in the ash excretion
roller, an output of
the ash excretion motor being connected to an axle of the ash excretion
roller.
Preferably, the fuel supply device has a hopper, a rotor and a feed motor, a
feed pipe
being under the hopper and in communication with an opening in the hopper, the
rotor
being contained in the feed pipe and having a spiral sector formed thereon,
the feed motor
having an output being connected to the rotor.
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Preferably, the hopper is of conical and the rotor is disposed under a bottom
of the hopper
having a smaller cross-sectional area.
Preferably, the boiler further has an ash tray under an outlet of the
combustor.
These and other objectives, features, and advantages of the present invention
will become
apparent from the following detailed description, the accompanying drawings,
and the
appended claims.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
Fig. 1 is a schematic top view of the preferred embodiment of the invention.
Fig. 2 is a right side view thereof.
Fig. 3 is a cross-sectional view along B-B in Fig. 1.
Fig. 4 is a cross-sectional view along A-A in Fig. 1.
Fig. 5 is a partial view thereof. And,
Fig. 6 is another partial view thereof.
DETAILED DESCRIPTION OF THE INVENTION
The invention provides a boiler which is able to increase a use ratio of heat
energy of fuel
therein and decrease a malfunction ratio thereof.
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With reference to Figs. 1 to 6, Fig. 1 is a schematic top view of the
preferred embodiment
of the invention. Fig. 2 is a right view thereof. Fig. 3 is a cross-sectional
view along B-B
in Fig. 1. Fig. 4 is a cross-sectional view along A-A in Fig. I. Fig. 5 is a
partial view
thereof. And, Fig. 6 is another partial view thereof.
The boiler of the invention has a tank 9, a gas pipe 6, a hearth 5, a
combustor 1, and a
fuel supply device. The hearth 5 is disposed in the tank 9 and has a bottom in
communication with the combustor 1. The combustor 1 is a place for the fuel to
burn.
High temperature gas produced by the burning in the combustor 1 enters the
hearth 5.
One end of the gas pipe 6 is in communication with a gas exit of the hearth 5,
and the
other end thereof passes through the hearth 5. A portion of the gas pipe 6 in
the hearth 5
extends spirally.
The fuel supply device is for conveying fuel to the combustor 1 and is in
communication
with a fuel inlet of the combustor 1.
In the boiler of the invention, fuel is supplied to the combustor 1 by the
fuel supply
device. The high temperature gas produced by the burning in the combustor 1
enters the
gas pipe 6 via the hearth 5. The portion of the gas pipe 6 in the hearth 5
extends spirally.
Water contained in the tank 9 is heated via the gas pipe 6. Gas exits the gas
pipe 6 after
heat is fully absorbed.
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In the boiler of the invention, a way of heating is changed from a
conventional type of
"fire surrounding water" to a "water surrounding fire". The gas pipe 6
directing the high
temperature gas therein passes through the tank 9, and the hearth 5 and the
gas pipe 6 are
disposed in the tank 9. All heat giving out from the hearth 5 and the gas pipe
6 is
absorbed by the water contained in the tank 9. The portion of the gas pipe 6
in the hearth
is spiral in order to increase a running distance of the gas in the gas pipe
6. A time for
heat exchange between the gas in the gas pipe 6 and the water in the tank 9 is
thus being
increased. Heat in the high temperature gas is able to be absorbed fully and a
heat energy
use ratio is able to be increased. At the same time, since the "water
surrounding fire" type
of heating in which the gas pipe 6 passes through the tank 9, a clog of the
water pipe by
incrustation will no longer exist. A malfunction rate of the boiler is thus
being decreased.
In the boiler of the invention, the portion of the gas pipe 6 in the tank 9 is
a main part
thereof for heating the water in the tank 9, and the portion extends in the
tank 9 spirally.
The portion is able to extend in any pattern of spiral in the tank 9. More
preferably, the
portion of the gas pipe 6 in the tank 9 extends spirally round an outer
surface of the
hearth 5. This pattern of spiral is able to make a structure of the boiler of
the invention
more compact. As a more preferable resolution, a plurality of heat exchange
fins or
needles are formed on the portion of the gas pipe 6 in the tank 9. The heat
exchange fins
or needles are able to increase a contact area between the gas pipe 6 and
water, which
will increase heat exchange ratio and make more heat in the high temperature
gas in the
gas pipe 6 be absorbed.
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In a working process of the boiler of the embodiment, the high temperature gas
in the gas
pipe 6 from the hearth 5 contains a lot of dust. In order to decrease the
negative effect of
the dust in the gas to atmosphere, a dust collection box 12 is provided at the
end of the
gas pipe 6 passing through the tank 9. At least one filter screen is disposed
in the dust
collection box 12. Dust is able to be filtrated to the dust collection box 12
when gas
passes through the filter screen. A content of dust in an emission may be
decreased. The
dust in the dust collection box 12 is able to be cleaned termly when a certain
amount is
accumulated. An exhaust fan 121 is able to be disposed at an outlet of the
dust collection
box 12. For a better effect of filtering, more layers of filter screens can be
disposed in the
dust collection box 12. Preferably, the layers of the filter screen are placed
parallel with
respect to each other. And more preferably, the layers of the filter screen
are placed
parallel and staggerly, in a distal and a proximal end of the dust collection
box 12.
In the above mentioned boiler, when the gas pipe 6 heats the water in the tank
9, a body
of the tank 9 may lose some heat. To decrease the heat dissipation of the body
of the tank
9, one heat insulation layer may be provided round an outer surface of the
tank 9. A heat
dissipation ratio may be diminished by the heat insulation layer. A water
inlet and a water
outlet are provided in the body of the tank 9 respectively for water injection
and drainage.
In the working process of above boiler, the high temperature inevitably
contains a large
amount of incompletely burn gas such as carbon monoxide. Such gas has not been
combusted completely and will cause not only insufficient use of the heat
energy from
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combustion but also atmosphere pollution. For a resolution, a plurality of air
supply holes
52 is defined in a wall of the hearth 5. An air supply chamber 51 is formed on
an outside
surface of the hearth 5 surrounding the plurality of air supply holes 52. An
air supply pipe
8 is provided air communicating an air inlet of the air supply chamber 51. Air
is supplied
into the hearth 5 and then mixed with the high temperature therein. In a high
temperature
circumstance, plenty of air helps the uncompleted burn gas combust at a second
time,
which brings a more completed combustion. For a more preferably resolution,
the air
supply chamber 51 of the hearth 5 is of a circular shape and the air supply
holes 52 are
evenly disposed in the hearth 5. This feature is able to ensure air be
supplied into the
hearth 5 in various direction via the air supply hole 52 in the second time
air supply. An
effect of air supply may be improved.
In the above boiler, the combustor 1 is a place where burning occurs. The
combustor 1
can be of any type. The embodiment provides a combustor 1 having a combustion
chamber, an ash excretion roller 101 and an ash excretion motor 10.
An ignition bar 11 is provided in a bottom of the combustion chamber. A
plurality of air
inlets are defined in the bottom near a fuel inlet of the combustion chamber.
The ash
excretion roller 101 is disposed in the bottom near an ash outlet of the
combustion
chamber and rolls in a direction to the ash outlet. The ash excretion roller
101 is of barrel
shape having air vents defined in a wall thereof.
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An air supply chamber 102 is disposed under the combustion chamber. The air
supply
chamber 102 is in communication with the air inlets at the fuel inlet and the
air vents in
the ash excretion roller 101.
An output of the ash excretion motor 10 is connected to an axle of the ash
excretion roller
101. The ash excretion roller 101 is driven to rotate by the ash excretion
motor 10.
In working of the boiler 1, fuel enters the combustion chamber via the fuel
inlet and air is
supplied into the combustion chamber through the air supply chamber 102. As
the fuel
burns, ash is pushed to exit by the rotation of the ash excretion roller 101.
Ash is able to
excrete at all times from the combustion chamber, and scorification caused by
accumulation of ash after combustion will be able to be avoided.
For complete burning of the fuel before being excreted by the ash excretion
roller 101,
the above ash excretion motor 10 may be a batch type motor and be controlled
by an
electric control box 13 provided on the boiler 1.
The fuel supplied by the fuel supply device to the combustor 1 in the
invention can be
various type and way of conveying. In this embodiment, the fuel supply device
has a
hopper 3, a rotor 21, and a feed motor 4.
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A feed pipe 2 is provided under the hopper 3 and in communication with an
opening in
the hopper 3. The rotor 21 is contained in the feed pipe 2. A spiral sector is
formed on the
rotor 21.
An output of the feed motor 4 is connected to the rotor 21.
In the working of the fuel supply device, the rotor 21 is driven to rotate by
the feed motor
4 and the fuel in the hopper 3 will be conveyed to the combustor 1 under a
push of the
spiral sector through the feed pipe 2. Fuel feeding is thus being automated.
For sufficient time for complete burning of the fuel after entering the
combustor 1, the
feed motor 4 may be a batch type motor and be controlled by the electric
control box 13
provided on the boiler 1.
The hopper 3 is a part for fuel storage. For smoother moving of fuel, the
hopper 3 is of
conical shape and the rotor 21 is disposed under a bottom thereof having a
smaller cross-
sectional area. In the process of fuel feeding, subsequent fuel automatically
drops to the
opening of the hopper 3 and is conveyed by the rotor 21.
In this embodiment of the boiler, an ash tray 7 is provided under the outlet
of the
combustor 1. Ash produced by the fuel after combustion enters the ash tray 7
and is
collected thereby.
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From above description, it is seen that the objects of the present invention
have been fully
and effectively accomplished. Embodiment of the invention has been shown and
described for the purposes of illustrating the functional and structural
principles of the
present invention and is subject to change without departure from the
invention's
principles. Therefore, this invention includes all modifications encompassed
within the
spirit and scope of the following claims.
